. Author manuscript; available in PMC: 2017 Dec 20.
Published in final edited form as: Soc Sci Med. 2017 Apr 27;184:40–48. doi: 10.1016/j.socscimed.2017.04.042
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).